working example

cli/src/history.rs

@@ -0,0 +1,26 @@
+use std::fd::{File, OpenOptions};
+use std::io::{BufReader, BufWriter, Read, Write};
+use xdg::BaseDirectories;
+
+pub struct History(File);
+
+impl History {
+    pub fn open(serie: spond_api::SeriesId) -> std::io::Result<Self> {
+        let xdg_dirs = BaseDirectories::with_prefix(env!("CARGO_PKG_NAME"));
+        let path = xdg_dirs.place_state_file(format!("{}.bin", serie))?;
+
+        let file = OpenOptions::new()
+            .create(true)
+            .append(true)
+            .read(true)
+            .open(&path)?;
+
+        Ok(Self(file))
+    }
+
+    pub fn append<I>(&mut self, selected: usize, ids: I) -> io::Result<()>
+    where
+        I: IntoIterator,
+        I::Item: Into<u128>,
+        I::IntoIter: ExactSizeIterator,
+}